Can a 460V 3 phase 60Hz electrical motor run safely on a 380V 3 phase 50Hz supply?

Answer 1

its answer is YES because 220 is a phase voltage in three phase system and line voltage for three phase system is 220*1.732=381 or 380. thus motor runs.

<<>>

The above answer is wrong. Just because one leg to ground voltage is 220 volts on a 380 volt system does not allow the three phase motor to run off of one leg of a three phase system. A three phase motor is wound with three sets of coils which, if connected as above, the other two motor coils would not get energised.

<<>>

When a motor runs on 380V three phase, it is connected in star, which means that one end of each of the three motor windings are connected together to create a star point. The other end of each motor winding is connected to one of the three phases.

If you only have 220V supply, you can still run the motor, but then you need to use a current inverter (or drive) to divide the 220V supply into three phases and the motor MUST then be connected in DELTA. This is achieved by connecting the windings end to end.

Here is a diagram of a delta and a star (or Y) connection

Answer 2

=== === === === === === === === You should already know that what you are discussing involves doing some extremely dangerous procedures... Don't even think about doing any such thing as unwinding a step-up transformer to operate on this kind of voltage! It is equally dangerous to consider using capacitor and auto-transformer "hook-ups", as described below, on this kind of voltage! Even a fully qualified electrical engineer, who has served a suitable period of technical training, would not consider such tasks to be sensible "DIY" things to do: such re-winding of Transformers, or building of auto-transformer/capacitor assemblies, can only be done safely in a workshop having appropriate manufacturing equipment and safe electrical power testing facilities. But, considering the time and costs involved, it is doubtful that it makes any sense at all to do it!

The only sane answer to this question is to buy - either new or secondhand - a motor that has been designed and tested to run safely on the actual mains supply you want to use.

<><><> I've been studying this for a while. I have a 40 horsepower 380V (33kw) 3 phase Chinese motor that I need to get working from 240V single phase. Seems that it can be done, but you'll have to purchase and unwind a step-up transformer to come close to the 380 Volts needed. From my research, 60 hertz power will run the 50hz motor faster, but the good thing is that most motors will run 10% plus or minus their ratings. Nobody here in the USA seems to have a good solid answer for this. An ebayer called Unique Three phase shows how to make an auto transformer to generate the 3rd leg of a three phase power system from a single phase source - in a nutshell, he's setting up a run capacitor and adding in other capacitors via a bank of switches to balance each leg of power to the motor. If anyone else has practical experience with doing this - answer this better!

=== === IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

If you do this work yourself, always turn off the powerat the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator to insure the circuit is, in fact, de-energized.

Answer 3

You simply connect the 460 / 60 motor, to the 380 / 50 supply. The key is something called the V/F ratio. (voltage to frequency ratio). Doing the math, 460 volt divided by 60 Hz equals 7.6 volts per Hz. By the same example 380 volts divided by 50 Hz is also 7.6 Volts/Hz. A bit of further math (460/380) shows the there is a difference of 1.21 : 1 between the voltages. So basically. divide your 460 motor power, speed, etc by 1.21 and you'll get the new values of the 460 motor running on 380 volt.

Answer 4

Yes, however, the RPM will increase by 20%, if the motor is connected to a shaft or driving something that can not handle the torque, then you might run to heating issues or performance issues.

Answer 5

You can do it that way, however it may run not full speed and can burn up if run for long enough. BE CAREFULL! IM NOT RESPONSIBLE FOR ANYTHING THAT HAPPENS TO THE MOTOR, YOU OR ANYTHING ELSE INCLUDING OTHER PEOPLE!

Answer 6

It won't run on that supply unless the voltage is transformed up, and then the frequency will probably make it run 20% faster.

Answer 7

No it can't be run safely

Answer 8

Use a VFD (Such as the Altivar Series).